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I've watched that video and I remember they mentioned referencing the original patent for their project. Aren't they pretty much violating a patent by doing this? The idea seems pretty novel and original to me but I'm not a neuroscientist nor a lawyer. Anyone want to clarify?

While the majority can't, lots of older folk can still hear high frequency noise. In face, age related hearing loss isn't really related to age at all, simply noise exposure (folks in really rural areas don't suffer from it nearly as badly if at all). For those who can't, it may very well still be damaging their hearing in small (but long term) ways, and will definitely kill high frequency hearing if you haven't lost it yet. Beyond that, there's also a point where you can't hear the noise, it just gives you a headache. Who knows how much business those establishments have lost simply because some patrons have subconsciously associated shopping there with pain.

I'm 27 and I can hear the frequency emitted by that device very clearly. Of the friends I asked, age ranges from 25-35, only two couldn't hear it (ages 28 and 34). One of my friends is an audiologist and apparently that frequency range is often inaudible to teenagers if they spend a lot of time listening to loud music. So, it's works really well at deterring the quiet teenagers and young to middle-aged adults...

And yet, when you get in trouble, your first call will be to 911 and the first responder will most likely be a police officer who will try and help you or your family in any way he can.

I'll order a pizza instead. The pizza guy will show up sooner, might actually help, and is less likely to hassle me instead. Cops are good for providing paperwork required by insurance companies, and little else.

Pardom me if I have nothing but contempt for cops, but I have seriously been in a situation where I (as a pizza guy) had just been robbed, was still bleeding, and the cop hassled me for consuming his valuable time with my problems, called me stupid for delivering pizza to that neighborhood, and then gave me a ticket for some some expired sticker. Oh, and made sure to get free pizza from the restaurant.